CN2289798Y - Oxygen-enriched coal powder injection device for ironmaking furnace - Google Patents
Oxygen-enriched coal powder injection device for ironmaking furnace Download PDFInfo
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- CN2289798Y CN2289798Y CN 95226969 CN95226969U CN2289798Y CN 2289798 Y CN2289798 Y CN 2289798Y CN 95226969 CN95226969 CN 95226969 CN 95226969 U CN95226969 U CN 95226969U CN 2289798 Y CN2289798 Y CN 2289798Y
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Abstract
To improve oxygen enrichment coal injection effects of a blast furnace and avoid that the coal power sprayed by the original blast gun is entrained by high-speed hot blast and enveloped centrally so as to beforehand concentrate and form 'coal streamline' which is difficult to diffuse, and fully split, gasify and burn, coal injection devices are arranged at the upper part of the (1), or at the position from the (1) to the (6), or at one position or positions among from the (1) to the (6) in the picture 1; for example, blast guns shown in the picture 2, or 13, or 15, etc., are increased at the position from the A to the Ao, or from the B to the Bo, etc.; the A' to the A'o or the B' to the B'o is provided with the picture 3 or the picture 5, or the A' to the A'o or the B' to the B'o is provided with the picture 7 or the picture 9, or endless tubes used for coal injection shown in the picture 11, or 12 are arranged at the position from the A' to the A'o or the B' to the B'o. A small quantity of the oxygen enrichment sprays from the vicinity of the device. The upstream combustion provides economically and effectively the downstream coal injection with the hot wind of the high temperature in order to realize omnibearing and multilevel and full combustion of the coal.
Description
The utility model belongs to field of metallurgy, relates to the improvement of iron-smelting blast furnace oxygen-enriched coal spray device.
Blast furnace is for improving injecting coal quantity now, and the briquet replacing coke charcoal falls over each other to design oxygen coal spray gun of all kinds.Coal dust is carried through gas suspension, sprays in the stove by the air port through spray gun inside and outside (cover) pipe respectively with oxygen.Useful single rifle, there is off-centre to split rush-harvesting and rush-planting, also aerobic, coal set up separately, have and be with spiral ribs enhancing air-flow to stir in the pipe, study catalyzer in addition and weaken the bridged bond bonding force, make coal dust discharge fugitive constituent in advance, reduce kindling temperature and catch fire in advance and prolong combustion time.More than all existing rate of combustion that improves coal dust of imitating of research for briquet replacing coke reduces pig iron cost, promotes the smooth operation of furnace volume increase to bring into play good effect.Yet however, further improving injecting coal quantity (more than the 150-200kg/TFe) coal dust still can not be fully burned often.Sneak into slag and slag is become sticky be difficult to emit outside the stove, or cause cupola well to pile up influence the stove heart and cohesive zone is breathed freely, fluidity, cause blast wandering; Or fly out outside the stove not only contaminate environment but also cause significant wastage with top gas.Only depend on the increase oxygen depletion to realize many coal powder injections now.Yet the oxygen consumption has increased pig iron cost again.Shown in " external iron and steel " 95 year the 6th phase, P21 Fig. 7 (below be abbreviated as " figure in the document 1 "), no matter single rifle or rush-harvesting and rush-planting, hot-air flow center coal powder density is bigger, and oxygen concn lower (rush-harvesting and rush-planting is more even slightly than single rifle).The coal dust gasification, and combustion that is not able to do in time promptly skims over the air port rapidly and enters in the stove in a short period of time.Unburnt coal dust is just many more in the big more stove of injecting coal quantity.
The purpose of this utility model will solve above-mentioned further raising coal combustion rate and injecting coal quantity exactly, reduces the problem that oxygen enrichment percentage ran into.The concentration of hot-air flow central oxygen shown in the figure is low because its coal powder density height causes in the document 1.Analyzing the high reason of coal powder density is that pulverized coal particle is bigger than gas molecule inertia, thereby after being entrainmented (hot blast temperature high viscosity more is big more) fast by hot blast center high velocity air, promptly be rolled in the air-flow center and concentrate formation " coal dust streamline ", be difficult to spread apart abundant gasification, and combustion, and skim over the air port rapidly with the high speed central gas stream and enter blast furnace.So improving coal combustion rate and injecting coal quantity reduces measure that oxygen enrichment percentage takes and will cross and concentrate on same pipeline section as far back as the hot-air flow center and form " coal dust streamline " this total design around avoiding and eliminate single rifle or rush-harvesting and rush-planting coal powder injection, the one, or increase spray gun quantity to three or more than three, or use instead and enclose hot-air flow periphery coal powder injection annular distance or circumferential weld.And at its upstream or hot-air flow center, downstream oxygen enrichment a little, eliminate its downstream " the coal dust streamline of charing " with oxidation.The 2nd, or at hot-air flow center use gradually expanded form outline spray gun, and put taper or spherical thing or shell over against the spray gun outlet, the vertex of a cone or spherical crown vault are to the even water conservancy diversion of spray gun export center, force breeze airflow to spray to or hot-air flow that the eddy flow tangential periphery is quickened by flaring type outline by the hot-air channel center, and in the eddy current that its downstream forms further gasification, and combustion.The 3rd, maybe will load onto the position of stating the coal powder injection device and be increased to two or more, promptly disperse to spray into coal dust and the oxygen enrichment upstream coal dust hot blast temperature that can raise cost-effectively that burns in advance from many places, hot blast upstream and downstream, then the downstream coal dust has just had more competent cracking heat, repeats this process repeatedly and just can make all coal dusts be able to the comprehensive part gasification, and combustion that fills at many levels.
Concrete solution of the present utility model is as follows:
Or increase spray gun quantity to three or more than three, and making that coal powder density further is tending towards evenly in the hot blast, or increase spray gun insertion position to two or more, its upstream or downstream spray gun quantity are more than one or one.Promptly disperse to spray into coal dust from many places, hot blast upstream and downstream, make the upstream coal dust firing provide more competent cracking heat for the downstream sprays into coal dust, also be equivalent to make the burning focus a little away from coke and near coal dust, thereby realize improving the purpose that whole coal combustion rate reduces coke ratio saying.Still can " digest the coal dust streamline of charing " by the effect of bend pipe eddy current mixing oxygen coal such as spray into coal dust on a small quantity in hot blast bend pipe upstream.For preventing that soot depost from should control injecting coal quantity and some composition of coal ash part, particularly ash certainly, or spray combustion gas or oil or other heat-generating agent, or directly divide into the regular ash discharge of regular ash-hole at bend pipe.Perhaps many spray guns in above-mentioned each position are changed into and enclose hot-air flow periphery coal powder injection annular distance or circumferential weld pipe: be about to the breeze airflow house steward and be divided into cross-sectional area and be its half two arms; form an annulus after surrounding two semicircles respectively; along the perforate of endless tube inwall or crack; circular planes flows to perpendicular to hot blast; or be the ellipse garden endless tube of other angle; whole annular distance or circumferential weld pipe or lean against on hot-air channel week sidelining, or be set in its refractory lining surface, be difficult for scaling loss with the protection endless tube.Annular distance or the circumferential weld of breeze airflow on the endless tube inwall sprays into hot blast from the hot-air flow periphery, and from periphery to the moving process of center uniformly dispersing on the hot-air flow entire cross section with the hot blast comprehensive engagement, thereby in time and fully with wherein oxygen reaction gasification, burning.If oxygen enrichment only needs in the endless tube upstream or hot-air flow center, downstream adds on a small quantity, be directly used in quick oxidation and eliminate its downstream and be compiled in hot-air flow center still unburnt " charing coal dust streamline ", do not get rid of oxygen supply in the endless tube certainly yet.Along with the distance increase of leaving breeze airflow house steward bifurcation, the wide increase gradually of annular distance or circumferential weld equates to each position annular distance of annulus or the breeze airflow total-resistance of circumferential weld place substantially to guarantee house steward, thereby injecting coal quantity is even and the difficult coal dust deposition that forms is stopped up; Or enclose hot-air flow periphery coal powder injection annular distance or circumferential weld pipe for changing convenient (or casting or weldering) flange packing type that above-mentioned annular distance or circumferential weld pipe are made, and be clipped in the middle of flange connects in the tuyere device, open flange can change at any time; Or (or casting or weldering) the ball ring type of making encloses in the middle of the parts of hot-air flow periphery coal powder injection annular distance or the sphere butt joint in tuyere device of circumferential weld pipe clamp, opens the spring pull bar and can change at any time.Or change for damping down not and to use following structure oxygen coal spray gun: change former spray gun outer tube outlet into the gradually expanded form outline: outer tube outlet welding frustum or billiard table housing quicken hot blast around it.In pipe outlet welding frustum or billiard table housing and put taper therein or spherical thing or shell (being welded in interior or outer tube goes out prostomum or billiard table shell root edge) with the connection of refractory alloy bar, the vertex of a cone or spherical crown vault be over against the inner cone or the billiard table columella heart, and evenly water conservancy diversion makes oxygen or breeze airflow spray to the above-mentioned hot blast that is accelerated of hot-air channel periphery by the hot-air channel center transduction flow circle tangent line at the bottom of awl or the billiard table of radially or putting english.Awl or spherical thing bottom back side and on every side or the protection of awl, spherical shell back side knotting refractory materials.Inside and outside frustum drift angle and taperer or shell drift angle keep certain relation, or the inside and outside billiard table radius of a ball and the certain relation of spherical crown radius of a ball maintenance, guarantee inner cone or the outlet of billiard table shell and awl or spherical thing or shell and suitable with former outlet area, can not stop up because of blowing to the slack-off deposition that causes of periphery to guarantee oxygen or breeze airflow speed with the circumferential weld area of outer cone or billiard table shell composition.Owing to the even guiding oxygen coal mixed airflow effect of awl or spherical thing or shell, oxygen (or coal dust) air-flow of pipe ejection blows to the hot-air flow that is accelerated at the bottom of above-mentioned outer tube gradually expanded form awl or the billiard table on every side with coal dust (or oxygen) air-flow of its outer (cover) pipe ejection on every side in forcing like this.Certainly the high speed hot-air flow also has the very strong effect of entrainmenting to them.Leave around gradually expanded form awl or the billiard table shell when forming eddy current in its downstream when hot blast carries oxygen, coal mixed airflow, they promptly are able to abundant mixing each other.Therefore hot blast just is able to rapid thermal degradation gasification, and combustion coal dust.Thereby avoid too early formation " coal dust streamline ".Should there be certain prolongation effect the coal dust perfect combustion time of relative 0.006-0.040 of the time of above-mentioned blending process second.Or add that coal dust does carrier gas with the combustion gas of certain calorific value, meet pure oxygen and further reduce its burning-point again and premature ignition, simultaneously the combustionvelocity of combustion gas molecule is more faster than the velocity of diffusion of pulverized coal particle in the oxygen, thus guarantee pulverized coal particle go out spray gun immediately burned gas heat.Make pulverized coal particle can shift to an earlier date (deciding) and reach kindling temperature and catch fire, realize more fast pyrogenation, needn't wait coal dust fully to contact and be heated to discharge fugitive constituent and reach its burning-point behind the hot blast and just catch fire on fuel gases calorific value and coal.It is identical with catalyzer to be that combustion gas plays a part.Combining with above-mentioned formation eddy current blending process, is a strong promotion to prolonging coal dust firing time raising coal combustion rate.Blast furnace gas is that only just premature ignition heating at crucial moment of carrier gas is done in the combustion gas of main certain calorific value, and the heating coal dust makes it the rapider kindling temperature that reaches, and the intensification of a large amount of coals, cracking heat are still provided by hot blast and the burning of coal dust self fugitive constituent.Size and spray gun position (or at the belly pipe or in the air port or double the putting in many places, hot-air channel upstream and downstream) at above-mentioned gradually expanded form awl or billiard table shell and awl or spherical thing or shell position are decided according to coal spraying process: under alap oxygen enrichment percentage situation, to guarantee the prolonging coal dust firing time, improve under the big coal injection amount more than the rate of combustion to 80%, the size of spray gun outer tube outlet gradually expanded form awl or billiard table is unlikely to big influence is caused in air port (if spray gun insertion air port) and hot-air channel air feed area, and no coking is degree in the hot air duct.Select the large diameter air port in case of necessity, insert tube according to size overstriking spray gun at the bottom of outer tube awl or the billiard table, the nozzle lid changes can start two halves round flange disc type sealing cover, or many at a place inserts this spray gun, inserts barrel dliameter and enlarges a little and get final product.
In a word, or increase spray gun quantity, or use instead and generally enclose hot-air flow periphery coal powder injection annular distance or circumferential weld pipe, or flange packing type coal powder injection annular distance or circumferential weld pipe, or ball pad type coal powder injection annular distance or circumferential weld pipe, or flaring type outline adds awl or spherical thing or shell water conservancy diversion spray gun, and with them or place hot blast bend pipe upstream, make coal dust and hot blast form eddy current place mixing at bend pipe, or place on the whole hot-air channel, the many places, downstream, all be for a total design: it is bigger than gas molecule inertia because of pulverized coal particle effectively to avoid former spray gun to spray into the coal dust of hot-air flow exactly, be rolled in the air-flow center after being entrainmented by the high speed hot blast, too early and concentrate on same pipeline section and form and be difficult to spread apart clean-burning " coal dust streamline ", and manage to make it slow slightly and enter in the stove, eliminate it to a certain extent.Make all coal dusts disperse from hot-air flow periphery and many places, upstream and downstream thereof to spray into, on the one hand in time and the abundant mixing of oxygen comprehensive engagement in the hot blast, on the other hand
Part upstream coal dust burns in advance, the rising hot blast temperature, thereby make the downstream coal dust obtain competent cracking heat and quicker decomposes gasification, and combustion.Even the oxygen in pure oxygen that also sprays into and the hot blast is as yet in the contact oven before the coke, at first multi-level fully oxidation coal dust thereby reduce oxygen enrichment percentage improves coal combustion rate.
Describe in detail below in conjunction with accompanying drawing:
The Fig. 1 that draws is an improved coal powder blowing device synoptic diagram on existing tuyere device.
(1) is blast-furnace hot-air surrounding pipes;
(2) swan neck;
(3) straight tube;
(4) hot blast bend pipe;
(5) belly pipe;
(6) air port;
(7) blast furnace hearth;
(8) insert the oxygen coal gun shower nozzle;
(9) spray gun inserts tube;
(10) spring pull bar.
The Fig. 2 that draws is former oxygen coal gun shower nozzle (8) longitudinal sectional drawing of using in the spray gun insertion tube (9) that is inserted in Fig. 1 belly pipe (5).Wherein:
(11) be spray gun outer (cover) pipe;
(12) coal supply powder (or oxygen) air-flow;
(13) pipe in the spray gun;
(14) oxygen supply (or coal dust) air-flow;
(15) hot-air flow.
The Fig. 3 that draws encloses the longitudinal sectional drawing (C～Co of Fig. 4 is to sectional view) that hot-air flow periphery coal powder injection annular distance pipe is set in hot-air channel refractory lining surface.Wherein:
(16) be the hot-air channel shell;
(17) refractory lining (higher refractoriness);
(18) enclose hot-air flow periphery coal powder injection annular distance tube wall;
(19) enclose hot-air flow periphery coal powder injection annular distance (increasing) with leaving coal supply powder total air flow (25) distance;
(20) hot-air flow;
(21) the right air-flow of coal supply powder;
(22) hot-air channel shell verge of opening;
(23) the breeze airflow house steward is communicated with a tube transitions;
(24) coal supply powder air-flow house steward;
(25) coal supply powder total air flow;
(26) a coal supply powder left side air-flow.
The Fig. 4 that draws is that C '～C ' o of Fig. 3 is to sectional view.Wherein:
(16) hot-air channel shell;
(17) hot-air channel refractory lining;
(18) enclose hot-air flow periphery coal powder injection annular distance tube wall;
(19) enclose hot-air flow periphery coal powder injection annular distance (increasing) with leaving coal supply powder total air flow (25) distance;
(20) hot-air flow;
(23) coal supply powder air-flow house steward is communicated with a tube transitions;
(24) coal supply powder air-flow house steward;
(25) coal supply powder total air flow;
(22) hot-air channel shell verge of opening.
The Fig. 5 that draws encloses vertically (Fig. 6 E～Eo to) sectional view that hot-air flow periphery coal powder injection circumferential weld pipe is set in hot-air channel refractory lining surface.Wherein:
(27) hot-air channel shell;
(28) hot-air channel refractory lining (higher refractoriness);
(29) enclose hot-air flow periphery coal powder injection circumferential weld tube wall;
(30) enclose hot-air flow periphery coal powder injection circumferential weld (widening gradually) with leaving coal supply powder total air flow (36) distance increase circumferential weld;
(31) hot-air flow;
(32) the right air-flow of coal supply powder;
(33) hot-air channel shell verge of opening;
(34) coal supply powder air-flow house steward is communicated with a tube transitions;
(35) coal supply powder air-flow house steward;
(36) coal supply powder total air flow;
(37) a coal supply powder left side air-flow.
The Fig. 6 that draws is that Fig. 5 D-Do is to sectional view.Wherein:
(27) hot-air channel shell;
(28) hot-air channel refractory lining (higher refractoriness);
(29) enclose hot-air flow periphery coal powder injection circumferential weld tube wall;
(30) enclose hot-air flow periphery coal powder injection circumferential weld (widening gradually) with leaving coal supply powder total air flow (36) distance increase circumferential weld;
(31) hot-air flow;
(34) breeze airflow house steward (35) is communicated with a tube transitions;
(35) coal supply powder air-flow house steward;
(36) coal supply powder total air flow;
(33) hot-air channel shell verge of opening.
The Fig. 7 that draws is that the flange packing type encloses vertically (Fig. 8 G-Go to) sectional view of hot-air flow periphery coal powder injection annular distance pipe.Wherein:
(38) flange;
(39) the flange packing type encloses hot-air flow periphery coal powder injection annular distance tube wall (a routine square-section);
(40) the flange packing type encloses hot-air flow periphery coal powder injection annular distance (increasing increase gradually with leaving coal dust total air flow (45) distance);
(41) flange refractory lining;
(42) hot-air flow;
(43) the right air-flow of coal supply powder;
(44) coal supply powder air-flow house steward;
(45) coal supply powder total air flow;
(46) a coal supply powder left side air-flow.
The Fig. 8 that draws for F～Fo of Fig. 7 to sectional view, wherein:
(38) flange;
(41) flange refractory lining.
(39) the flange packing type encloses hot-air flow periphery coal powder injection annular distance tube wall;
(40) the flange packing type encloses hot-air flow periphery coal powder injection annular distance (with leaving the coal dust total air flow
(45) distance increases increase gradually);
(42) hot-air flow;
(47) coal supply powder air-flow house steward is communicated with a tube transitions;
(45) coal supply powder total air flow;
(44) coal supply powder air-flow house steward.
The Fig. 9 that draws encloses vertically (Figure 10 I～Io to) sectional view of hot-air flow periphery coal powder injection circumferential weld pipe for the flange packing type.Wherein:
(48) flange;
(49) the flange packing type encloses hot-air flow periphery coal powder injection circumferential weld tube wall (a routine square-section);
(50) the flange packing type encloses hot-air flow periphery coal powder injection circumferential weld;
(51) flange refractory lining;
(52) hot-air flow;
(53) the right air-flow of coal supply powder;
(54) coal supply powder air-flow house steward;
(55) coal supply powder total air flow;
(56) a coal supply powder left side air-flow.
The Figure 10 that draws for H～Ho of Fig. 9 to sectional view.Wherein:
(48) flange;
(51) flange refractory lining;
(49) the flange packing type encloses hot-air flow periphery coal powder injection circumferential weld tube wall;
(50) the flange packing type encloses hot-air flow periphery coal powder injection circumferential weld (with leaving the coal dust total air flow
(55) the distance increase is widened gradually);
(52) hot-air flow;
(57) coal supply powder air-flow house steward is communicated with a tube transitions;
(55) coal supply powder total air flow;
(54) coal supply powder air-flow house steward.
The Figure 11 that draws is that the ball ring type encloses hot-air flow periphery coal powder injection annular distance pipe and sphere joint unit wiring layout.Wherein:
(58) protruding sphere joint unit.
(59) protruding sphere joint unit refractory lining.
(60) the ball ring type encloses hot-air flow periphery coal powder injection annular distance tube wall.
(61) the ball ring type encloses hot-air flow periphery coal powder injection annular distance (increase with the distance of leaving coal supply powder total air flow (65), annular distance increases gradually);
(62) concave spherical surface joint unit;
(63) concave spherical surface joint unit refractory lining;
(64) coal supply powder air-flow house steward is communicated with a tube transitions;
(65) coal supply powder total air flow;
(66) coal supply powder air-flow house steward.
The Figure 12 that draws is that the ball ring type encloses hot-air flow periphery coal powder injection circumferential weld pipe and sphere joint unit wiring layout.Wherein:
(67) protruding sphere joint unit;
(68) protruding sphere joint unit refractory lining;
(69) the ball ring type encloses hot-air flow periphery coal powder injection circumferential weld tube wall;
(70) the ball ring type encloses hot-air flow periphery coal powder injection circumferential weld (increase with the distance of leaving coal supply powder total air flow (74), circumferential weld is widened gradually);
(71) concave spherical surface joint unit;
(72) concave spherical surface joint unit refractory lining;
(73) coal supply powder air-flow house steward is communicated with a tube transitions;
(74) coal supply powder total air flow;
(75) coal supply powder air-flow house steward.
The Figure 13 that draws is a gradually expanded form outline oxygen coal gun shower nozzle longitudinal sectional drawing.Wherein:
(76) spray gun outer tube (refractory alloy material);
(77) coal supply powder (or oxygen) air-flow;
(78) pipe (refractory alloy material) in the spray gun;
(79) oxygen supply or (coal dust) air-flow;
(80) outer tube frustum housing (refractory alloy material);
(81) spray gun outer tube frustum girdle seam outlet;
(82) the fire-resistant overcoat of taperer;
(83) taperer;
(84) taperer awl feather edge;
(85) fixedly connected bar (refractory alloy);
(86) oxygen, coal dust, hot-air flow meet;
(87) hot-air flow;
(88) pipe frustum girdle seam outlet in;
(89) pipe frustum housing (refractory alloy) in.
The Figure 14 that draws for J～Jo of Figure 13 to sectional view.
(85) fixedly connected bar;
(82) the fire-resistant overcoat of taperer;
(83) taperer.
The Figure 15 that draws is the gradually expanded form outline oxygen coal gun shower nozzle longitudinal sectional drawing of band rotation inducer.Wherein:
(90) spray gun outer tube (refractory alloy);
(91) coal supply powder (or oxygen) air-flow;
(92) pipe (refractory alloy) in the spray gun;
(93) outer tube frustum housing (refractory alloy);
(94) pipe frustum housing (refractory alloy) in;
(95) outer tube frustum girdle seam outlet;
(96) conical shell (refractory alloy);
(97) refractory heat-insulating thing;
(98) rotation inducer (refractory alloy);
(99) pipe frustum girdle seam outlet in;
(100) hot-air flow;
(101) fixing rib;
(102) oxygen supply (or coal dust) air-flow.
The Figure 16 that draws is the side-view of Figure 15.Wherein:
(93) outer tube frustum housing (refractory alloy);
(95) outer tube frustum girdle seam outlet;
(94) pipe frustum housing (refractory alloy) in;
(96) conical shell (refractory alloy);
(99) pipe frustum girdle seam outlet in;
(98) rotation inducer (refractory alloy);
(101) fixing rib.
Explain detailedly below in conjunction with drawings and Examples.
Fig. 1 is an improved coal powder blowing device synoptic diagram on existing tuyere device.Hot blast enters blast furnace hearth (7) by bustle pipe (1) through swan neck (2), straight tube (3), hot blast bend pipe (4), belly pipe (5), air port ⑹.General and belly pipe (5) the maintenance level attitude of oxygen coal gun.Oxygen jar gun sprayer (8) as shown in Figure 2, as interior (fire) flame anoxic, it is effective that interior pipe oxygen supply is managed oxygen supply than outer (cover).Rush-harvesting and rush-planting is more effective than single rifle.The utility model to the innovative approach of coal powder injection device is or increases spray gun quantity to three or more than three (as Fig. 1 (4) B～Bo place), or its upstream (as B '～B ' o), or its downstream (as B '～B ' o sphere butt joint or by upstream end) increases more than one or one spray gun or eccentric the plant.As interior pipe oxygen supply, easily by the coal dust abrading section, put the jet body protection of gas jet in the tube wall outside.Really can be evenly many on the hot-air flow cross section as increasing to two rifles in the document 1 shown in the figure than single rifle coal powder injection, or locate or the eccentric simultaneously spray gun that inserts in many places one of in the upstream of Fig. 1 (1) or (1) to (6) every parts pipeline section, make coal dust be dispersed in first afterfire on the vertical different pipe sections of hot-air flow.Elder generation's incendiary coal dust provides competent cracking heat for the coal dust of afterfire.(with comparing with coke-oven gas burning hotblast stove) solves the not enough problem of blast furnace air temperature cost-effectively promptly.Comprising hot blast eddy current mixing effect in order effectively to utilize hot blast bend pipe (4) to locate, " digestion coal dust streamline ", with spray gun place bend pipe (4) before (upstream) effect have big change, even single insertion of the simplest coal spouting gun (oxygen adds from cold wind).Can make that oxygen fully contacts with coal dust in the hot blast because locate to form eddy current, produce the pyrolysis gasification burning at once at bend pipe (4).Certainly the words downstream hot-air channel that needs should use the refractory lining or the control injecting coal quantity of higher refractoriness, makes the hot-air flow temperature be no more than 1350 ℃ of the common upper limits.Coal dust influences that hot blast bend pipe vision slit (under Fig. 1 (4) left side) observes can be at a small amount of Coal powder spray in bend pipe (4) upstream, or with the vision slit tube suitably to prolonging away from cupola well (7) direction, or the instantaneous reduction injecting coal quantity carries out observing in the stove, recovers injecting coal quantity after the observation again.Plugging in rifle position height can be by simple and easy ladder operation.Open such as A～Ao in Fig. 1 or A '～A ' o place and to insert tube some can to insert spray gun some.Many at every place and many places are provided with better certainly, yet will avoid a large amount of soot depost bonding hot-air channels.Such as some composition in control upstream injecting coal quantity or coal ash part or the ash, or oil spout or combustion gas or other heat-generating agent, or directly divide into the regular ash discharge of regular ash-hole etc. at bend pipe (4).Certainly all be arranged on bend pipe (4) downstream and can reduce the soot depost bonding.Perhaps many spray guns in each position are changed into and enclose hot-air flow periphery coal powder injection annular distance or the even coal powder injection effect of circumferential weld will be better.Fig. 3 encloses vertically (Fig. 4 C～Co to) sectional view of hot-air flow periphery coal powder injection annular distance pipe.This coal powder injection endless tube is divided into two tributaries about (26), (21) with coal supply powder total air flow (25), and the annular distance that breeze airflow is held successfully on its inwall (19) sprays into hot-air flow (20) periphery.Left and right sides arm cross section is shown in (18) among Fig. 4, area be house steward half, become the semicircle endless tube by the refractory alloy circumference of cannon bone, the inboard plurality of opening (19) of endless tube or side or circle or other shape, and increase (Fig. 4 (19)) with the distance of leaving coal dust total air flow (25), it is constant to add endless tube stroke resistance summation with the resistance to flow output that guarantees each hole breeze airflow, thereby two arms surrounded a full circle endless tube and are welded on transition and are communicated with on (23) about each hole injecting coal quantity of annulus evenly and was not resulted in blockage.The two arm the other ends or sealing or be interconnected are inserted it in hot-air channel shell (16) again, aim at and weld with the verge of opening (22) on (16).Then at hot-air channel shell (16) and enclose the refractory materials (17) that knotting between the hot-air flow periphery coal powder injection endless tube (18) is lined with higher refractoriness in than former usefulness, in case coal combustion rate improves the high temperature ablation that is produced.Circular planes or flow to vertical with hot blast or be the ellipse garden endless tube of other angle, and annular distance (19) is surperficial concordant protruding or recessed with refractory lining (17), to hot-air flow (20) periphery.Though the coal powder injection endless tube is changed difficult and needed body wind, and is not fragile.In the moving process of center, pass through whole hot-air flow cross section at coal dust by the hot-air flow periphery, with the hot blast comprehensive engagement, make that coal powder density is tending towards even in the hot-air flow, avoid " the coal dust streamline " that be difficult to spread apart to form too early effectively, or at its upstream or a small amount of oxygen enrichment in hot-air flow center, downstream can eliminate " the coal dust streamline of charing " that forms in its downstream to a certain extent.Certainly do not get rid of oxygen supply in the endless tube yet.If being enclosed hot-air flow periphery coal powder injection annular distance pipe, this place one of the upstream of Fig. 1 (1) or (1) to (6) each parts pipeline section to locate or many places, then obtain annular distance pipe (Fig. 4) in the evenly coal powder injection of hot-air flow periphery, and by periphery evenly to hot-air flow center diffusion and hot blast bend pipe eddy current once more mixing hot blast, coal dust and above-mentioned vertical dispersion spray into the multiple comprehensive action of coal dust, thereby obtain the effect of better gasification, and combustion coal dust.Certainly also note aforementioned soot depost adhesion problem.Fig. 5 is for enclosing vertically (Fig. 6 E～Eo to) sectional view of hot-air flow periphery coal powder injection circumferential weld pipe.4 annular distances (19) of changing plan are circumferential weld (30), stitch wide with leave coal dust total air flow (36) the distance widen (Fig. 6 (30)), its action principle is identical with annular distance pipe (Fig. 4), and effect is better than annular distance.For the ease of replacing, or above-mentioned annular distance pipe or circumferential weld pipe are made (or casting or weldering) flange packing type enclose hot-air flow periphery coal powder injection rectangular cross section annular distance pipe (Fig. 7,8) or circumferential weld pipe (Fig. 9,10), be clipped in "～A as Figure 1A; , get final product between the many places flange such as B "～B " o.Action principle and Fig. 3, Fig. 5 annular distance pipe, circumferential weld pipe are identical, and do not need with the welding of hot-air channel shell and be set in the hot-air channel inside liner, only need open flange connect promptly replaceable, compare with spray gun simultaneously not fragile yet, although need damping down to change.Figure 11, Figure 12 illustrate the two sphere joint unit intermediary ball ring types that are clipped in the tuyere device and enclose hot-air flow periphery coal powder injection annular distance pipe or circumferential weld pipe wiring layout, can be clipped in as between the many places sphere butt joints such as Figure 1A "～A " o, B "～B " o.Can cast (or weldering) ball ring type annular distance pipe (60) or circumferential weld pipe (69) earlier, be communicated with (64) or (73) with transition again it is communicated with breeze airflow house steward (66) or (75) welding.Major advantage is to change conveniently, only need open spring pull bar (Fig. 1 (10)) and get final product.Action principle and front annular distance circumferential weld pipe are identical, all be difficult to spread apart gasification, and combustion " coal dust streamline " for avoiding former spray gun concentrate to form too early at the hot-air flow center, and by at its upstream or a small amount of oxygen enrichment in downstream and then promote the elimination of " the coal dust streamline of charing " that its downstream forms to a certain extent.Thereby the raising coal combustion rate reduces oxygen enrichment percentage.Figure 13 illustrates a kind of damping down that do not need and changes and one of can be in the upstream of Fig. 1 (1) or (1) to (6) each parts pipeline section locate or many places, many insertions in every place spray to the lance head longitudinal sectional drawing of periphery by the hot blast center.This spray gun also can avoid former spray gun to form " coal dust streamline " too early.Be about to Fig. 2 outer tube (11) welding gradually expanded form outline frustum housing (80), and manage frustum shell (89) embedded with conical thing (83) in spray gun, the vertex of a cone is internally managed the even water conservancy diversion in (78) axle center, makes oxygen (or coal dust) air-flow spray to periphery (86) by the hot-air channel center.Frustum shell (80) quickens hot-air flow (87) around it.The frustum shell (89) of its cone apex angle and interior pipe (78) outlet welding and the cone apex angle of taperer (83) have certain relation, to manage (76) outlet area suitable with interior pipe (78), outer (cover) respectively for the area that guarantees its circumferential weld outlet (81), (88), thereby oxygen and breeze airflow can be not slack-off because of spraying to the periphery flow velocity, so that cause problem such as coal dust deposition obstruction.Taperer (83) awl feather edge (84) welds fixedly connected bar (refractory alloy) (85) and the refractory protection cover (82) of tiing a knot, and then pipe or outer tube outlet frustum shell root edge in fixedly connected bar (85) the other end and the spray gun is fixed and welded together.Because taperer (83) is water conservancy diversion evenly, the hot blast (87) that pipe oxygen supply (or coal dust) air-flow (79) was accelerated around spray gun outer tube frustum (80) end in forcing dispels by outer (cover) pipe ring and stitches coal dust (or oxygen) air-flow that (81) spray.Certainly high speed hot-air flow (87) locates also to have the effect of entrainmenting to above-mentioned oxygen, coal mixed airflow in (86), when hot blast (87) carries oxygen, their abundant each other mixings when the coal dust mixed airflow leaves its meet (86) at its downstream formation eddy current.Like this, hot blast just is able to heat at first rapidly, the cracking coal dust, thereby avoids former spray gun to form " coal dust streamline ", the drawback that is difficult to spread apart burning too early in high speed hot blast center effectively when the coal powder injection of hot blast center.Should there be certain prolongation effect above-mentioned relative 0.006～0.040 second coal dust perfect combustion time of time of entrainmenting and forming downstream eddy current process.Or adding that coal dust does carrier gas with combustion gas, combustion gas itself meets its burning-point of pure oxygen and further reduce, and the premature ignition burning plays a part identical with the coal dust firing catalyzer with regard to the fugitive constituent that is equivalent to coal dust and discharged (particularly to hard coal with regard to).And the combustionvelocity of combustion gas molecule is much larger than the velocity of diffusion of pulverized coal particle in the oxygen, thereby coal dust is by rapider heating, discharges fugitive constituent more in advance and reaches its kindling temperature and light than the hot blast heating.Locate to entrainment effect with above-mentioned (86) and form the downstream eddy current and prolong the combustion time process and combine, will produce a strong promoter action improving coal combustion rate.Here be that to do carrier gas only be that it has lower kindling temperature and premature ignition in pure oxygen in main combustion gas with certain calorific value with the blast furnace gas, the heating at crucial moment, the heating coal dust discharges some fugitive constituents in advance, thereby (deciding on coal and fuel gases calorific value) combusting coal fines in advance, and the burning of the volatilization gasification product that the intensification of a large amount of coals, cracking heat are still discharged by hot blast and coal dust self provides.Taperer (83) and frustum shell (80), (89) are refractory alloy, and generally oxygen or the coal dust cold material air-flow by the spray gun ejection cools off.The size at spray gun outer tube outlet frustum (80) end is required to decide by coal spraying process: both can guarantee that coal dust fully burns (rate of combustion is more than 80%) under low oxygen enrichment percentage, be not degree in the hot-air channel coking again.If frustum (80) end circle inserts tube greater than spray gun.Should insert barrel dliameter according to its external diameter overstriking spray gun, and nozzle external welding flange, two halves round flange disc type sealing cover can be started in order to fixing.Or one many at place insert this rifle, insert barrel dliameter and enlarge a little and get final product.Figure 15 is similar to the spray gun shown in Figure 13, pipe outlet welding frustum housing (94) and its outlet within it put and added (or weldering or casting) in the annulus (99) that conical shell (96) constitutes rotation inducer (98) is arranged, oxygen (or coal dust) air-flow that makes ejection is along the ejection of circumferential weld tangential direction, and coal dust (or oxygen) air-flow that outer tube is exported the frustum shell (93) of welding and circumferential weld (95) ejection that frustum shell (94) constitutes blows to the hot-air flow (100) that frustum shell (93) is accelerated on every side.Three air-flows mix the back and form eddy current in frustum shell (93) downstream and further mix, and make coal dust be able to abundant thermal decomposition gasification combustion.Compare with spray gun shown in Figure 13, refractory protection cover (82) changes the refractory heat-insulating thing (97) of knotting in conical shell (96) lining into, with protection conical shell (96).Simultaneously show that also (83) itself also can change the cone shell of belt edge (84) among Figure 13.For making refractory heat-insulating thing (97) knotting firmly, in the conical shell (96) or casting or weldering add fixing rib (101).Or the transduction flow of in outer tube frustum shell (93) circumferential weld (95), putting english; or in making; outer frustum girdle seam (99), (95) bispin streaming gradually expanded form oxygen coal spray gun; it is located or many places one of in the upstream of Fig. 1 (1) or (1) to (6) each parts pipeline section; and many at every place inserts hot-air flow; all can promote all coal powder injection devices of effect as managing interior oxygen supply, easily by the coal dust abrading section, put the jet body protection of gas jet in the tube wall outside
In a word, above-mentioned several improvement: or increase the eccentric hot-air flow that inserts in many at spray gun quantity one place and many places, or many places are used instead and are enclosed hot-air flow periphery coal powder injection annular distance or circumferential weld (Fig. 3,5), or the flange packing type encloses hot-air flow periphery coal powder injection annular distance or circumferential weld (Fig. 7,9), or the ball ring type encloses hot-air flow periphery coal powder injection annular distance or circumferential weld (Figure 11,12); Or flaring type outline adds awl or spherical thing or shell water conservancy diversion spray gun (Figure 13,15), and they are placed bend pipe (4) upstream or many places, hot-air channel upstream and downstream, all be for a design: effectively avoid since former coal spouting gun to spray into the coal dust of hot-air flow bigger than gas molecule inertia because of pulverized coal particle, and the hot-air flow center big pressure of flow velocity is low, be rolled in the hot-air flow center after being entrainmented by center high speed hot blast and concentrate too early and form " coal dust streamline ", and manage to eliminate it.Behind above-mentioned coal powder injection device, coal dust is sprayed in the vertical multi-faceted dispersion of periphery and upstream and downstream of hot-air flow, and slow slightly entering in the stove, impel hot blast and spray into pure oxygen at first multi-level thermal decomposition gasification combustion coal dust that fully contacts before the coke in gasification combustion furnace.
Claims (8)
1. an iron-smelting blast furnace is to dispose one or two spray guns at belly pipe (5) with novel oxygen-enriched coal spray device at present; Spray gun or eccentric the plant; Gun type has general straight pipe type coal spouting gun, or coal spouting gun adds spray oxygen and rob, or coaxial sleeve tube oxygen coal spray robs, or interior pipe is coal supply powder gas flow tube, and circumferential weld is the oxygen supply passage between inner and outer pipe, or interior pipe is the oxygen supply pipe, and circumferential weld is a coal supply powder gas channel between inner and outer pipe; Its material is a common metal, or is refractory alloy, or is used pottery or refractory materials; The suspension pulverized coal conveying is done carrier gas with air or nitrogen or combustion exhaust, and the utility model oxygen-enriched coal spray device is characterised in that: spray gun quantity is more than three or three; Its upstream or downstream spray gun quantity are that one or two s' upstream and downstream spray gun quantity is more than one or one comprising former rifle quantity; Spray gun or for being suitable for doing with combustion gas the carrier gas of pulverized coal conveying with the spray gun that the carrier gas of suspension pulverized coal conveying is done in combustion gas; Spray gun or spray combustion gas or oil or other heat-generating agent for the spray gun that is suitable for spraying combustion gas or oil or other heat-generating agent; Coaxial sleeve tube oxygen coal spray gun outer tube is a coal supply powder gas flow tube, and when interior pipe was the oxygen supply tracheae, its outer wall was easily disposed the gas shield nozzle and jet body by the coal dust wearing and tearing; Gun type comprises that also inside and outside telescoping spray gun outlet is that awl or spherical thing or shell are put in flaring type outline and pipe outlet, and the vertex of a cone or spherical crown vault are to the novel coaxial sleeve tube oxygen coal spray gun in spray gun axle center; All spray guns or be contained in the upstream of (1), or locate one of one of in (1) to (6) parts or in multi-part or each parts or in each parts pipeline section or many places or each parts between a place or many places or everywhere.
2. novel oxygen-enriched coal spray device according to claim 1 is characterized in that in the spray gun that pipe (78) or outer tube (76) outlet flaring type outline awl or billiard table shell root edge fix awl or a ball crown type thing or a shell with refractory alloy union lever (85) welding, the interior refractory materials of tiing a knot of around it and the back side or shell.
3. novel oxygen-enriched coal spray device according to claim 1 it is characterized in that managing in the spray gun awl (94) or awl (96) or a spherical thing or a shell fixed in the welding of billiard table shell root edge, its bottom outside has the rotation inducer, or the rotation inducer be added in pipe go out prostomum or billiard table shell lower curtate outer rim, or above the two have inducer concurrently, in awl or the spherical crown shell fixing rib is arranged, and the knotting refractory materials.
4. an iron-smelting blast furnace is with novel oxygen-enriched coal spray device, be to dispose one or two spray guns at present at belly pipe (5), same design based on three or three above spray guns of claim 1, the utility model oxygen-enriched coal spray device is characterised in that with enclosing hot-air flow periphery coal powder injection annular distance pipe or circumferential weld pipe, or coaxial sleeve tube oxygen coal injection annular distance pipe or circumferential weld pipe, or the annular distance pipe or the circumferential weld pipe of its semi-ring or any radian, or the ring outer tube is the oxygen supply tracheae, interior pipe is coal supply powder gas flow tube, or the ring outer tube is a coal supply powder gas flow tube, interior pipe is the oxygen supply tracheae, its outer wall is easily disposed the gas shield nozzle and jet body by the coal dust wearing and tearing, and above-mentioned endless tube comprises: the GENERAL TYPE endless tube places in the hot-air channel; Flange packing type endless tube is clipped in the middle of the hot-air channel flange interconnecting piece; Ball ring type endless tube is clipped in the middle of the hot-air channel sphere joint unit, endless tube or for being suitable for doing with combustion gas with the winding-up endless tube that the carrier gas of suspension pulverized coal conveying is done in combustion gas the carrier gas of pulverized coal conveying; Or spray combustion gas or oil or other heat-generating agent for the winding-up endless tube that is suitable for spraying combustion gas or oil or other heat-generating agent; Endless tube inner side-wall annular distance or circumferential weld are to hot-air flow, and annular distance is several more than one; Each endless tube upstream or downstream one segment distance or put oxygen lance or the winding-up endless tube.
5. oxygen-enriched coal spray device according to claim 4 is characterized in that the circumferential weld of the size in general annular distance pipe ring hole or circumferential weld pipe is wide and increases with leaving coal supply powder air-flow house steward (24) or (35) distance, above-mentioned annular distance pipe or circumferential weld pipe or place the upstream of (1) or one of (1) to (6) parts or multi-part or one of each parts or each parts pipeline section are located or many places.
6. oxygen-enriched coal spray device according to claim 4 is characterized in that the circumferential weld of the size in used flange packing type annular distance pipe ring hole or circumferential weld pipe is wide and increases with leaving coal supply powder total air flow (45) or (55) distance, above-mentioned annular distance pipe or circumferential weld pipe place the upstream of (1) or each flange connection of (1) to (6) parts between one of locate or many places or everywhere.
7. oxygen-enriched coal spray device according to claim 4 is characterized in that the circumferential weld of the size in used ball ring type annular distance pipe ring hole or circumferential weld pipe is wide and increases with leaving coal supply powder total air flow (65) or (74) distance, above-mentioned annular distance pipe or circumferential weld pipe or place the upstream of (1) or each sphere of (1) to (6) parts is located one of between docking or many places or everywhere.
8. it is characterized in that spray gun and the winding-up endless tube or the alternate double configuration arbitrarily of its coal powder injection or combustion gas or oil or other heat-generating agent according to claim 1,4 described oxygen enriched blast coal injection devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95226969 CN2289798Y (en) | 1995-11-09 | 1995-12-13 | Oxygen-enriched coal powder injection device for ironmaking furnace |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95225756 | 1995-11-09 | ||
| CN95225756.4 | 1995-11-09 | ||
| CN 95226969 CN2289798Y (en) | 1995-11-09 | 1995-12-13 | Oxygen-enriched coal powder injection device for ironmaking furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2289798Y true CN2289798Y (en) | 1998-09-02 |
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ID=34065670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95226969 Expired - Fee Related CN2289798Y (en) | 1995-11-09 | 1995-12-13 | Oxygen-enriched coal powder injection device for ironmaking furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2289798Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736118B (en) * | 2008-11-18 | 2011-09-07 | 中冶天工建设有限公司 | Installation method of track beam of oxygen lance for steel-making converter |
| CN102312029A (en) * | 2011-01-24 | 2012-01-11 | 张昭贵 | Air supplying device of blast furnace as well as combustion method and oxygen-enriching method of injected coal powder thereof |
| CN102485913A (en) * | 2010-12-01 | 2012-06-06 | 张昭贵 | Method and device for blast furnace to blow coal powder |
| CN102037304B (en) * | 2008-05-23 | 2013-03-20 | 保尔伍斯股份有限公司 | Method for feeding pulverised coal into a blast furnace |
| CN103131810A (en) * | 2011-11-29 | 2013-06-05 | 张昭贵 | Blast furnace oxygen enrichment coal powder injection device and method off-line assembly and disassembly thereof |
| CN103328657A (en) * | 2011-01-18 | 2013-09-25 | 杰富意钢铁株式会社 | Blast furnace operation method |
| CN103672866A (en) * | 2013-11-25 | 2014-03-26 | 中国科学院过程工程研究所 | Device and method for preheating combustion of jetting pulverized coal used in iron-making process |
-
1995
- 1995-12-13 CN CN 95226969 patent/CN2289798Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102037304B (en) * | 2008-05-23 | 2013-03-20 | 保尔伍斯股份有限公司 | Method for feeding pulverised coal into a blast furnace |
| CN101736118B (en) * | 2008-11-18 | 2011-09-07 | 中冶天工建设有限公司 | Installation method of track beam of oxygen lance for steel-making converter |
| CN102485913A (en) * | 2010-12-01 | 2012-06-06 | 张昭贵 | Method and device for blast furnace to blow coal powder |
| CN103328657A (en) * | 2011-01-18 | 2013-09-25 | 杰富意钢铁株式会社 | Blast furnace operation method |
| CN103328657B (en) * | 2011-01-18 | 2016-06-22 | 杰富意钢铁株式会社 | Method for operating blast furnace |
| CN102312029A (en) * | 2011-01-24 | 2012-01-11 | 张昭贵 | Air supplying device of blast furnace as well as combustion method and oxygen-enriching method of injected coal powder thereof |
| CN103131810A (en) * | 2011-11-29 | 2013-06-05 | 张昭贵 | Blast furnace oxygen enrichment coal powder injection device and method off-line assembly and disassembly thereof |
| CN103672866A (en) * | 2013-11-25 | 2014-03-26 | 中国科学院过程工程研究所 | Device and method for preheating combustion of jetting pulverized coal used in iron-making process |
| CN103672866B (en) * | 2013-11-25 | 2016-04-06 | 中国科学院过程工程研究所 | A kind of iron-smelting process coal injection furnace preheat burner and method |
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